package com.zhongying.jf.util;

import com.zhongying.jf.exception.ZhongyingiException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import java.security.SecureRandom;

/**
 * @author liyuxuan
 * @Description
 * @Email liyuxuan@chinazyjr.com
 * Created on 2017/11/22 17:09
 * Copyright (c) 2017 All Rights Reserved.
 */
public class Base64Util {

    public static final Logger logger = LoggerFactory.getLogger(Base64Util.class);

    /**
     * 数据解密，			算法（DES）
     *
     * @param cryptData 加密数据
     * @param desKey    加密key
     * @return 解密后的数据
     */
    public static String decryptBasedDes(String cryptData, String desKey) throws ZhongyingiException {

        String decryptedData = null;
        try {
            // DES算法要求有一个可信任的随机数源
            SecureRandom sr = new SecureRandom();
            DESKeySpec deskey = new DESKeySpec(desKey.getBytes());
            // 创建一个密匙工厂，然后用它把DESKeySpec转换成一个SecretKey对象
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            SecretKey key = keyFactory.generateSecret(deskey);
            // 解密对象
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.DECRYPT_MODE, key, sr);
            // 把字符串解码为字节数组，并解密
            decryptedData = new String(cipher.doFinal(new sun.misc.BASE64Decoder().decodeBuffer(cryptData)));
        } catch (Exception e) {
            // log.error("解密错误，错误信息：", e);
            throw new ZhongyingiException("解密错误，错误信息：" + e);
        }
        return decryptedData;
    }

    /**
     * 数据加密，		算法（DES）
     *
     * @param data   要进行加密的数据
     * @param desKey 解密key
     * @return 加密后的数据
     */
    public static String encryptBasedDes(String data, String desKey) {
        String encryptedData = null;
        try {
            // DES算法要求有一个可信任的随机数源
            SecureRandom sr = new SecureRandom();
            DESKeySpec deskey = new DESKeySpec(desKey.getBytes());
            // 创建一个密匙工厂，然后用它把DESKeySpec转换成一个SecretKey对象
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
            SecretKey key = keyFactory.generateSecret(deskey);
            // 加密对象
            Cipher cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.ENCRYPT_MODE, key, sr);
            // 加密，并把字节数组编码成字符串
            encryptedData = new sun.misc.BASE64Encoder().encode(cipher.doFinal(data.getBytes()));
        } catch (Exception e) {
            logger.error("加密错误，错误信息：", e);
            throw new ZhongyingiException("加密错误!");
        }
        return encryptedData;
    }

    public static void main(String[] args) {
        System.out.println(encryptBasedDes("YREQ1123", "wang!@#$"));
        // System.out.println(decryptBasedDes("9WAGy+UdYUo=","wang!@#$"));
        //System.out.println(encryptBasedDes("xdAVV/xymH4=","wang!@#$"));
    }

}
